AttributeError: 'MRmean' object has no attribute 'mr'

执行：python Workspace/Ch5_Py_mrjob_PegasosSVM/mrMean.py –mapper < Workspace/Ch5_Py_mrjob_PegasosSVM/inputFile.txt
报错：Traceback (most recent call last):
File “Workspace/Ch5_Py_mrjob_PegasosSVM/mrMean.py”, line 43, in
MRmean.run()
File “/home/hduser/.local/lib/python2.7/site-packages/mrjob/job.py”, line 424, in run
mr_job.execute()
File “/home/hduser/.local/lib/python2.7/site-packages/mrjob/job.py”, line 433, in execute
self.run_mapper(self.options.step_num)
File “/home/hduser/.local/lib/python2.7/site-packages/mrjob/job.py”, line 502, in run_mapper
step = self._get_step(step_num, MRStep)
File “/home/hduser/.local/lib/python2.7/site-packages/mrjob/job.py”, line 485, in _get_step
steps = self.steps()
File “Workspace/Ch5_Py_mrjob_PegasosSVM/mrMean.py”, line 39, in steps
return ([self.mr(mapper=self.map, mapper_final=self.map_final,\
AttributeError: ‘MRmean’ object has no attribute ‘mr’
参考：https://blog.csdn.net/suiningys/article/details/79048443
修改：mrMean.py中 先from mrjob.step import MRStep，再将steps方法中的self.mr改为MRStep